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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 864 · 40 questions
TalentJR

How to do it in your head (Up and down): Find how far the number is from the nearest ten (the distance). Go that distance up and the same distance down, and multiply the two new numbers. Add the distance squared.

NameDateTime takenScore ___ / 40
  1. 1.43² =
  2. 2.89² =
  3. 3.33² =
  4. 4.82² =
  5. 5.84² =
  6. 6.66² =
  7. 7.38² =
  8. 8.76² =
  9. 9.85² =
  10. 10.37² =
  11. 11.34² =
  12. 12.65² =
  13. 13.47² =
  14. 14.99² =
  15. 15.79² =
  16. 16.68² =
  17. 17.93² =
  18. 18.61² =
  19. 19.72² =
  20. 20.97² =
  21. 21.96² =
  22. 22.98² =
  23. 23.49² =
  24. 24.35² =
  25. 25.64² =
  26. 26.88² =
  27. 27.44² =
  28. 28.94² =
  29. 29.56² =
  30. 30.87² =
  31. 31.45² =
  32. 32.62² =
  33. 33.42² =
  34. 34.41² =
  35. 35.77² =
  36. 36.36² =
  37. 37.92² =
  38. 38.81² =
  39. 39.71² =
  40. 40.59² =

Answer key

  1. 1849
  2. 7921
  3. 1089
  4. 6724
  5. 7056
  6. 4356
  7. 1444
  8. 5776
  9. 7225
  10. 1369
  11. 1156
  12. 4225
  13. 2209
  14. 9801
  15. 6241
  16. 4624
  17. 8649
  18. 3721
  19. 5184
  20. 9409
  21. 9216
  22. 9604
  23. 2401
  24. 1225
  25. 4096
  26. 7744
  27. 1936
  28. 8836
  29. 3136
  30. 7569
  31. 2025
  32. 3844
  33. 1764
  34. 1681
  35. 5929
  36. 1296
  37. 8464
  38. 6561
  39. 5041
  40. 3481

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